Sewing machine feeding mechanism



Sept. 19, 1933. A B CLAYTQN 1,927,489

SEWING MACHINE FEEDING MECHANISM Filed Oct. 29, 1951 2 Sheets-Sheet 1Wbfweoo:

wmm @Kaw/WMS Sept. 19, 1933. A B, CLAYTQN 1,927,489

SEWING MACHINE FEEDING MECHANISM Filed Oct. 29, V19151 2 Sheets-Sheet 2ndrewB. Clay/t0n.

Patentedv sept. 19, 1933 vThis invention relates toV sewing machines,more particularly of the cylinder-bed type, and has for an object toprovide such a machine with a feeding mechanism, the feed-dog of whichhas a parallel motion or, in other words, moves so that itswork-engaging surface is substantially parallel to the throat-plate atall times during its rising-and-falling and feeding-and-returnmovements. I believe I am the .first to provide a cylinder-bed sewingmachine with such a feedmotion arranged to feed the work in a directionacross or transversely of the cylinder-bed.

A feature of the invention is its compactness andpeculiarly efficientadaptibility to the requirements of a cylinder-bed chain-stitch sewingmachine wherein space is at apremium. Another feature of the inventionis its sturdiness and ability-to handle heavy work Vwithout undue strainon the parts.

With the above and other objects in view, as will hereinafter. appear,the invention comprises the devices, combinations and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the invention from which the severalfeatures of the invention and the advantages Vattained thereby will bereadily understood by those skilled in the art.`

Fig. 1 is an end view of the cylinder-bed of a sewing machine showing my`improved feeding mechanism incorporated therein. Fig. 2 is a top planview of the feeding mechanism; Fig. 3 is al view substantially on'theline 3 3, Fig. 2, with the feed-dog and its carrier-bar removed. y Fig.4 is a section on theline 4 4, Fig. 2. Figj is a section on the line 55, Fig. 2. Fig. 6 is a perspectivefview of the feed-bar. Fig. 7 is aperspective view of the feed-rocker, and Fig. 8 is a perspective view ofthe feed-rocker supporting.

and lifting means which may be calleda feedlift rocker. l'

1 represents the hollow cylinder-bed of a sewing machine within andlengthwise of which is the main-shaft 2. The throat-plate is shown at 3and the feed-dog at 4. Thefeed-ddg 4 has the usual shank 4' whichisseated in the groove 5 in the feed-bar 6 clamped to the pin 7 which`is journaled in the upstanding ears 8, 8 of the feedrocker 9. Thefeed-bar has an offset forked arm 10 which embraces the follower blockk11 on the feed-lift eccentric l2 on the main-shaft 2.

The feed-rocker 9 is fulcrumed on the supporting pin 13V of thefeed-lift rocker including the spaced arms 14 which carry the pin 13 andare fixed to the rock-shaft 15 journaled in the lower '-'1f-isEW1NGMAQHINEFEEDINGMECIM V`SM I. B.*C.laytlorlf:Unio-r1,Iy

The Si,nger.gMa11ufacturing Company, Eliza" ,p l .Liza .corporation Y VApplication October 29, 1931.. -SerialeNo.z571,704 l N. lJl',.assignervtof @ef-,New Jersey.

3 claims. (AC1. 112;,215?" rear corner of the cylinder-bed 1 in bearings16, 16. Adjustably clamped by screws 17' to the rockshaft-l is avertical arm 17 which is connected by a pitman 18 to a second feed-lifteccentric 19 on the main-shaft 2. The feed-lift eccentrics l2 60 and 19are timed to lift the frontl and rear ends 1 of the feed-bar 6substantially simultaneously and to substantially the same extent,thereby maintaining the feed-dog 4 in a horizontal position at all timeswith its teeth parallel to the throatplate 3.

The feed-rocker 9 has two ears ,20, 20 aording a long bearing for thepinL 21 to which pin is fixed the pitman 22 embracing the adjustablefeed-advancing eccentric 23 on the main-shaft. The collar 24 fixed tothe pin 21 between the ears 20, 20, holds kthe pin 21 against endwisemovement. 1

It will be observed that the` feed-rocker 9, whichsupports and lifts therear end of the feedbarv 6, is of the maximum vertical dimension allowedby the space within the cylinder-bed. This provision minimizes andrenders negligible the vertical component of motion of the rear end ofthe feed-bar about the pin 13 as a center.,8 0 A substantially trueparallel motion of the feedd* dog is thus more easily attained.

.By loosening the set-screws 17' which clamp the arm 17 to the feed-liftrock-shaft 15, the feed-.rocker 9 may be raised or lowered to adjust theplane of the feed-dog teeth to the desired parallel relation to thethroat-plate 3. By this same adjustment the feed-dog may of course betilted either 'forwardly or rearwardly as may be desired in certainspecial sewing operations where a fulling or stretching action isrequired. t

It is also to be noted that the present feedmechanismis entirely clearof the space below and in front of the main-shaft'which is occupied bythe looper-mechanism shown in my oopending g5 application Serial No.571,703, filed herewith. Q

Having thus set forth the -nature of the invention, what I claim hereinis:

1. In feeding mechanism for sewing machines, a main-shaft having threeeccentrics thereon twofoo of which are feed-lift eccentrics androne ofwhich@ is a feed-advance eccentric, a feed-dog, a feedbar carrying saidfeed-dog and supported at its front end by one of .said feed-lifteccentrics, a vertically disposed feed-rocker supporting then?05 rearend of said feed-bar, a `feed-lift rocker ful-t crumed in rear of saidfeed-rocker and pivotally carrying the latter, said feed-lift rockerincludingan upstanding arm, a horizontal pitman connection between saidupstanding arm and them:

2 other of said feed-lift eccentrics, and a horizontal pitman directlyconnecting said feedrocker and said feed-advance eccentric.

2. Feeding mechanism for sewing machines comprising a main-shaft havingtwo feed-lift eccentrics and one feed-advance eccentric thereon, afeed-bar supported at its front end by one of said feed-lift eccentrics,a feed-rocker arranged vertically in rear of the main-shaft andpivotally supporting bar at a point above the level of said main-shan, afeed-lift rocker pivotally carrying nid'ieadrocker, a pitmanconnectedvat one end to said feed-advance eccentric and at its otherend, connected directly to said feed-rocker at a point between thefeed-bar and the feed-lift rocker, and a horizontal pitman conneetimbetweuxthe feedlift rocker and the other feed-lift eccentric. Y

"mi i fis' the rear end of said feed.

` in the length of the Yeed-bar,

3. A sewing machine having a frame including a work-supporting bed inthe form of a hollow horizontal arm, a throat-plate, a shaft journaledwithin and lengthwise of said hollow horizontal arm, a feed-dog arrangedto feed the work transversely of the free end of said arm, a feed-bardsped transversely of and within the free end of said arm, afeed-eccentric on said shaft and connections for impartingfeed-and-return movements to said feed-bar, and a pair of feed-lifteccentrics on said shaft and independent connecttl for impartingsynchronized feed-lift movements to said feed-bar at two spaced pointsone of said connections including a Iced-lift rock-shaft journaledwithin and lengthwise of said arm.

ANDREW B. CLAYTON.

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